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Message-ID: <4B45E04C.7060905@codemonkey.ws>
Date: Thu, 07 Jan 2010 07:23:24 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] -serial stdio broken
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, qemu-devel <qemu-devel@nongnu.org>, "Richard W.M. Jones" <rjones@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>

On 01/07/2010 06:44 AM, Daniel P. Berrange wrote:
> NB, QEMU 0.12 introduces a new flag '-nodefaults' that can be used to
> get rid of this imlied 'serial stdio', and all other implied devices.
> It is well worth using this new -nodefaults flag if you're managing
> qemu from an app to avoid these surprises
>
> eg this should work as you'd expect it
>
>    qemu -nodefaults -nographic -serial stdio
>    

-nographic is basically equivalent to -serial mon:stdio,signal=on -vga 
none except it operates on defaults.  Your invocation actually ends up 
being very different as it doesn't multiplex the monitor and it doesn't 
disable ctrl-c.  Basically, your invocation is equivalent to qemu -vga 
none -serial stdio

The "bug" is the original invocation's addition of '-serial stdio'.  
That was basically ignored previously but you could imagine subtle 
changes in semantics (like ctrl-c behavior) that it could and arguably 
should have introduced.

Regards,

Anthony Liguori